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Elastoplastic damaging model for adhesive anchor systems. I / Antonino Spada in Journal of engineering mechanics, Vol. 137 N° 12 (Decembre 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 12 (Decembre 2011) . - pp.854-861 Titre : Elastoplastic damaging model for adhesive anchor systems. I : Theoretical formulation and numerical implementation Type de document : texte imprimé Auteurs : Antonino Spada, Auteur ; Giuseppe Giambanco, Auteur ; Piervincenzo Rizzo, Auteur Année de publication : 2012 Article en page(s) : pp.854-861 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Elastoplasticity  Damage  Pullout  Interfaces  Finite  element  method  Anchors  Implementation Résumé : In this and in the companion paper, the mechanical response of adhesive anchor systems is theoretically and numerically predicted and experimentally observed. The theoretical prediction is on the basis of an elastoplastic damaging model formulated to predict the structural response associated with the development of a fracture in adhesive anchor systems. This part describes the analytical model developed in the framework of a thermodynamically consistent theory, which assumes adhesion where the structure is sound, and friction in correspondence with the fracture. Isotropic damage is considered. The model can predict the structural behavior at the interface between two surfaces of ductile, brittle, or quasi-brittle materials. The Helmholtz free energy is written to model the materials’ hardening or softening. Isotropic damage is considered, and the possible effects of dilatancy are taken into account, including nonassociative flow rules. The formulation is implemented into the finite-element code FEAP. In the companion paper, the new model is adopted to predict the mechanical response to the pullout force of postinstalled rebar chemically bonded in concrete. The analytical model and the numerical implementation are experimentally validated by several pullout tests, which are monitored by using an acoustic-emission technique. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i12/p854_s1?isAuthorized=no [article] Elastoplastic damaging model for adhesive anchor systems. I : Theoretical formulation and numerical implementation [texte imprimé] / Antonino Spada, Auteur ; Giuseppe Giambanco, Auteur ; Piervincenzo Rizzo, Auteur . - 2012 . - pp.854-861. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 12 (Decembre 2011) . - pp.854-861 Mots-clés : Elastoplasticity  Damage  Pullout  Interfaces  Finite  element  method  Anchors  Implementation Résumé : In this and in the companion paper, the mechanical response of adhesive anchor systems is theoretically and numerically predicted and experimentally observed. The theoretical prediction is on the basis of an elastoplastic damaging model formulated to predict the structural response associated with the development of a fracture in adhesive anchor systems. This part describes the analytical model developed in the framework of a thermodynamically consistent theory, which assumes adhesion where the structure is sound, and friction in correspondence with the fracture. Isotropic damage is considered. The model can predict the structural behavior at the interface between two surfaces of ductile, brittle, or quasi-brittle materials. The Helmholtz free energy is written to model the materials’ hardening or softening. Isotropic damage is considered, and the possible effects of dilatancy are taken into account, including nonassociative flow rules. The formulation is implemented into the finite-element code FEAP. In the companion paper, the new model is adopted to predict the mechanical response to the pullout force of postinstalled rebar chemically bonded in concrete. The analytical model and the numerical implementation are experimentally validated by several pullout tests, which are monitored by using an acoustic-emission technique. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i12/p854_s1?isAuthorized=no

Elastoplastic damaging model for adhesive anchor systems. II / Antonino Spada in Journal of engineering mechanics, Vol. 137 N° 12 (Decembre 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 12 (Decembre 2011) . - pp.862-876 Titre : Elastoplastic damaging model for adhesive anchor systems. II : Numerical and experimental validation Type de document : texte imprimé Auteurs : Antonino Spada, Auteur ; Rizzo, Piervincenzo, Auteur ; Giuseppe Giambanco, Auteur Année de publication : 2012 Article en page(s) : pp.862-876 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Pullout  Finite  element  method  Structural  health  monitoring  Elastoplasticity  Experimentation  Validation Résumé : This paper presents the numerical and experimental validation of the analytical elastoplastic damaging model proposed in the companion paper (Part I). The validation was carried out by describing the pullout failure of epoxy adhesive anchors. Pullout tests were simulated numerically and performed experimentally. Several specimens made of a rebar embedded in a hardened concrete cylinder by means of polyester resin were tested. Conventional strain gauges and acoustic emission (AE) sensors were used to evaluate the structural response of the system and to monitor the onset and progression of structural damage, respectively. The parametric analysis and the moment tensor analysis of the AE data were used to discriminate among different sources of damage. The results show the ability of the model to predict the response of the anchors and the suitability of the AE method to monitor damage onset and propagation and to discriminate among different source of damage. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i12/p862_s1?isAuthorized=no [article] Elastoplastic damaging model for adhesive anchor systems. II : Numerical and experimental validation [texte imprimé] / Antonino Spada, Auteur ; Rizzo, Piervincenzo, Auteur ; Giuseppe Giambanco, Auteur . - 2012 . - pp.862-876. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 12 (Decembre 2011) . - pp.862-876 Mots-clés : Pullout  Finite  element  method  Structural  health  monitoring  Elastoplasticity  Experimentation  Validation Résumé : This paper presents the numerical and experimental validation of the analytical elastoplastic damaging model proposed in the companion paper (Part I). The validation was carried out by describing the pullout failure of epoxy adhesive anchors. Pullout tests were simulated numerically and performed experimentally. Several specimens made of a rebar embedded in a hardened concrete cylinder by means of polyester resin were tested. Conventional strain gauges and acoustic emission (AE) sensors were used to evaluate the structural response of the system and to monitor the onset and progression of structural damage, respectively. The parametric analysis and the moment tensor analysis of the AE data were used to discriminate among different sources of damage. The results show the ability of the model to predict the response of the anchors and the suitability of the AE method to monitor damage onset and propagation and to discriminate among different source of damage. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i12/p862_s1?isAuthorized=no